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Gubler, Philipp,Hattori, Koichi,Lee, Su Houng,Oka, Makoto,Ozaki, Sho,Suzuki, Kei American Physical Society 2016 Physical review. D Vol.93 No.5
<P>We investigate the mass spectra of open heavy flavor mesons in an external constant magnetic field within QCD sum rules. Spectral Ansatze on the phenomenological side are proposed in order to properly take into account mixing effects between the pseudoscalar and vector channels, and the Landau levels of charged mesons. The operator product expansion is implemented up to dimension-5 operators. As a result, we find for neutral D mesons a significant positive mass shift that goes beyond simple mixing effects. In contrast, charged D mesons are further subject to Landau level effects, which together with the mixing effects almost completely saturate the mass shifts obtained in our sum rule analysis.</P>
Identification of Functional Site of S-Modulin
Tachibanaki, Shuji,Nanda, Kumiko,Sasaki, Kenji,Ozaki, Koichi,Kawamura, Satoru Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
S-modulin in frog or its bovine homologue, recoverin, is a 26 kDa EF-hand $Ca^{2+}$-binding protein found in rod photoreceptors. The $Ca^{2+}$ -bound form of S-modulin binds to rhodopsin kinase (Rk) and inhibits its activity. Through this regulation, S-modulin is believed to modulate the light-sensitivity of a rod. In the present study, we tried to identify the interaction site of the $Ca^{2+}$ -bound form of S-modulin to Rk. First, we mapped roughly the interaction regions by using partial peptides of S-modulin. The result suggested that a specific region near the amino terminus is the interaction site of S- modulin. We then identified the essential amino acid residues in this region by using S-modulin mutant proteins: four amino acid residues were suggested to interact with Rk. These residues are located in a small closed pocket in the $Ca^{2+}$-free, inactive form of S-modulin, but exposed to the surface of the molecules in the $Ca^{2+}$ -bound, active form of S-modulin. Two additional amino acid residues were found to be crucial for the $Ca^{2+}$ -dependent conformational changes of S-modulin. The present study firstly identified the functional site of S-modulin, a member of a neuronal calcium sensor protein family.in family..
Consideration of a Face Recognition System with Real-time and Robustness
Hitoshi Horiuchi,Satoru Kaneko,Mie Sato,Koichi Ozaki,Masao Kasuga 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Capability of recognition, collision avoidance and communication with humans in natural is required for robots coexisting with humans. It is important that real-time and robust image processing for face recognition in a real environment. In this paper, we have developed a method of face recognition no depending on direction and size of human faces on various images. This method is include preprocess of a pattern matching algorithm based on the HSV color coordinate system and a rapid search algorithm by using the Genetic Algorithm (GA). For accurate face recognition, extracted images by an edge filter are used when a value of fitness on GA is evaluated. As a result, this system extracted face with about 65% accuracy.